This review summarizes the recent critical progress in manufacturing of large-aperture optics in high-power laser facility. It also emphasizes the technologies such as single point diamond fly-cutting, and aspheric ultra-precision grinding, as well as deterministic polishing, based on the deterministic ultra-precision process manufacturing …
Abstract. This article is written as a tribute to Professor Frederick Fongsun Ling 1927–2014. Single-point diamond machining, a subset of a broader class of processes characterized as ultraprecision machining, is used for the creation of surfaces and components with nanometer scale surface roughnesses, and submicrometer scale …
The diamond wheel wear mechanism and its impact on the surface generation of RB-SiC/Si carbide under parallel grinding were investigated. The machined surface was mainly characterized by surface fracture and diamond grits scratched plastic grooves, and the surface finish of the machined RB-SiC/Si improved with decreasing feed rate. But the …
In-feed grinding achieved a surface roughness of 7 nmRmax in ductile mode on optical glass BK 7 by a #1500 diamond grinding wheel with cutting edges of unified height. Read more Article
In precision grinding of optical glass using a diamond wheel, it is w ell known that the grain depth of cut must be less than the critical depth of cut dc [1] below which the glass is machined in ...
The previous research of precision grinding optical glasses with electrolytic in process dressing (ELID) technology mainly concentrated on the action of ELID and machining parameters when grinding, which aim at generating very "smoothed" surfaces and reducing the subsurface damage. However, when grinding spectrosil 2000 and BK7 …
Fine-grained resin bonded diamond tools are often used for ultra-precision machining of brittle materials to achieve optical surfaces. A well-known drawback is the high tool wear. Therefore, grinding processes need to be developed exhibiting less wear and higher profitability. Consequently, the presented work focuses on conditioning a mono …
Especially, ultra-precision grinding of large-scale free-form optics made of hard and brittle materials is faced with some difficult problems, such as an extremely complicated grinding process, overly long processing time, serious grinding wheel wear, and the measurement technique is not mature, which seriously affect the rapid …
Melrose Park, IL Finishing Service Company* $1 - 4.9 Mil 1977 10-49. Surface and double-disc grinding services for optical industry. Substrates include aluminum, steel, stainless steel, plastics, ceramic, glass and composite materials. Capable of handling parts from 0.125 to 25 in. dia. with +/-0.0001 in. tolerance.
The situation is somewhat different for diamonds that are used in optical windows, requiring highly polished surfaces. Particularly, for thermal spreader applications, both sides of the diamond must be polished. ... The quantitative and systematic study of diamond grinding and polishing was first introduced by Tolkowshy et al in 1920 [30, 31 ...
Figure 1 shows a commercially available single-point diamond turning and grinding machine. ... Because electroless nickel plating is diamond machinable, the workpiece can be single-point diamond machined to …
Optics can be divided into two categories: transmissive and reflective. Transmissive optics can be divided into three surface shapes and the associated machining opera tions are as below: (1) Flat optics - lapping and computer controlled polishing; (2) Spherical optics - conventional machining; (3) Aspherical optics - diamond machining,
A study on diamond grinding wheels with regular grain distribution was studied using additive manufacturing (AM) technology [37]. ... TG-DSC and an optical non-contact dilatometry were utilized to establish the best fit sintering plan for constructing the H-type grinding wheels. SEM as well as AFM and LSCM were used for material ...
THE COMPACT AND PRODUCTIVE DIAMOND TURNING LATHE. Used for the rapid production of spherical & aspheric optical lenses, mirrors, mold pins, freeform optics and even mechanical components. ... Optical Grinding, Correction. LEARN MORE. GLOBAL PRESENCE. Moore Tool Company, Inc. 800 Union Avenue Bridgeport, CT 06607 USA. …
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(1). Abrasive distance K in the x direction, with the unit of mm. During the grinding process, a change in K will cause a change in the maximum cutting thickness of a single abrasive grain; therefore, it is the main factor influencing the grinding wheel grinding force and chip space. (2). Abrasive distance f in the y direction, with the unit of mm. A …
Diamond turning, fly-cutting, and milling are the primary manufacturing technologies for generating free-form surfaces; however, they are not sufficiently effective in machining free-form optics on hard and brittle materials.Ultra-precision grinding has been demonstrated to have an outstanding capability in machining difficult-to-cut materials. . …
The works of electrolytic inprocess dressing (ELID) grinding of fused silica [7], grinding optical surface using the less than 6 μm grain-size diamond grinding wheel [8], and crack-free grinding ...
In the manufacturing processes of glass and ceramics components, grinding is a key technique for curvature generation (CG) of optical surface. However, dimension …
The left picture of Fig. 5 shows a metallic bonded diamond grinding wheel, which ensures high material removal by the use of extremely hard diamond grains. They create a rough appearance on the processed surfaces. ... Based on currently available results, a strongly visible grinding pattern is only an optical imperfection; a strength …
After dressing, the application characteristics of coarse-grained diamond grinding wheels were examined by grinding optical glasses, fused silica and …
Fine grained diamond grinding wheels are often utilized for ultra-precision (UP) grinding of optical glasses in "optical quality" in terms of high form accuracy and …
Chen et al. [23] and Deng et al. [24] proposed a truing method for arc-shaped resin-bonded diamond grinding wheel by performing circular interpolation movement along the sectional arc of diamond wheel using a rotating cylinder green silicon carbide (GC) rod.The schematic of diamond grinding wheel truing process is shown in Fig. 1 (a). The …
A high efficiency precision truing experiment for arc-shaped diamond grinding wheel is carried out on ultra-precision grinder NAS520X-CNC, the experimental setup is shown in Fig. 10.The parameters of the dressing experiments are shown in Table 2.In order to improve the truing efficiency, a 180# GC wheel was chosen to dress the120# diamond …
Fine grained diamond grinding wheels are often utilized for the precision machining of functional surfaces in "optical quality" (regarding form accuracy and …
At the feed rate of 10 mm/min, the average surface roughness was reduced from 132.5 nm to 40.6 nm after one pass of polishing (~9.3 min of polishing time). Selected SEM photos of the polished surface at different feed rates are also shown in Fig. 9 in order to compare the surface quality after polishing.
Transparent Windows and Optics Optical diamond is in large-volume production at Coherent. We consistently produce material of premium optical quality (low 1 μm scatter, low 10.6 μm bulk absorption, low birefringence at 632.8 nm) in a wide range of cross-sectional sizes and thicknesses. ... such as edge grinding, laser engraving, and optical ...
In ultra-precision grinding complex optical components with ball-end diamond wheels, radial runout will cause grinding marks on the workpiece surface, which will severely affect the performance of optical components. Therefore, it is necessary to investigate the formation mechanism of these grinding marks.
Diamond grinding wheels are used in a wide range of industries, including aerospace, mold manufacturing, semiconductor manufacturing, and optical processing. The diamond grinding wheel has a very high holding capacity and a long service life, and it is extremely abrasion resistant.
Determination of the grinding force on optical glass based on a diamond wheel with an ordered arrangement of abrasive grains. Zhibo Yang, Dongyu He, …